Verifying Current Output
Compare a set of currents measured by an external DMM to the current test points requested
by the NI 4113.
Refer to the following table as you complete the following steps.
Table 4.
Current Output Verification
Level Range Limit Range and
Limit
Test Point As-Found Output Test Limit (% of C
Offset)
6 A
10 V
0.1 A
0.15% + 20 mA
6 A
1.
Set the first specified level range, limit range, and limit on the NI 4113.
2.
Set the level on the NI 4113 to the first specified test point.
3.
Calculate the current through the shunt by completing the following steps.
a)
Take a voltage measurement across the shunt using the DMM.
b)
Divide the voltage measurement by the calibrated value of the shunt.
c)
Record the calculated value as
DMM Measured Current
.
4.
Calculate the lower and upper current output test limits using the following formula:
Current Output Test Limits
=
Test Point
± (|
Test Point
| ×
% of Current
+
Offset
)
5.
Verify that the recorded DMM value falls within the test limits.
6.
Repeat the previous four steps for each test point specified in the level range.
7.
If more than one level range is specified, repeat the previous steps using the values
specified in each level range.
Verifying Current Measurement
Compare a set of measured currents reported by the NI 4113 to the currents measured by an
external DMM.
Refer to the following table as you complete the following steps.
Table 5.
Current Measurement Verification
Level Range
Limit Range and
Limit
Test Point
As-Found Measurement Test Limit
(% of C Offset)
6 A
10 V
0.1 A
0.15% + 20 mA
6 A
1.
Set the first specified level range, limit range, and limit on the NI 4113.
2.
Set the level on the NI 4113 to the first specified test point.
8
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NI PXIe-4113 Calibration Procedure
